Slow Carrier Cooling in Hybrid Pb–Sn Halide Perovskites

Verma, Sachin; Gu, Qifei; Sadhanala, Aditya; Venugopalan, Vijay; Rao, Akshay

doi:10.1021/acsenergylett.9b00251

Cited by 40 publications

(76 citation statements)

References 35 publications

(98 reference statements)

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“…The carrier temperatures determined in this way are plotted in dark blue as cooling curves in Figure 2B,C, for two different excitation fluences. The initial temperatures from our measurements are around 450 K, which is somewhat colder than in several previous reports for similar initial carrier densities across a range of metal halide compositions, but on the same order of magnitude in many cases, 22,24,26,34,62 with only a few reports of temperatures exceeding 1000 K. 28, 30,35 Lower…”

Section: The Journal Of Physical Chemistry Letterscontrasting

confidence: 46%

Charge-Carrier Cooling and Polarization Memory Loss in Formamidinium Tin Triiodide

Savill

Klug

Milot

et al. 2019

Proceedings of the International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics

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Reports of slow charge-carrier cooling in hybrid metal halide perovskites have prompted hopes of achieving higher photovoltaic cell voltages through hot-carrier extraction. However, observations of long-lived hot charge carriers even at low photoexcitation densities and an orders-of-magnitude spread in reported cooling times have been challenging to explain. Here we present ultrafast time-resolved photoluminescence measurements on formamidinum tin triiodide, showing fast initial cooling over tens of picoseconds and demonstrating that a perceived secondary regime of slower cooling instead derives from electronic relaxation, state-filling, and recombination in the presence of energetic disorder. We identify limitations of some widely used approaches to determine charge-carrier temperature and make use of an improved model which accounts for the full photoluminescence line shape. Further, we do not find any persistent polarization anisotropy in FASnI 3 within 270 fs after excitation, indicating that excited carriers rapidly lose both polarization memory and excess energy through interactions with the perovskite lattice.

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Section: The Journal Of Physical Chemistry Letterscontrasting

confidence: 46%

Charge-Carrier Cooling and Polarization Memory Loss in Formamidinium Tin Triiodide

Savill

Klug

Milot

et al. 2019

Proceedings of the International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics

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“…Verma et al showed a two-stage carrier cooling dynamics in a series of MAPb 1−x Sn x I 3 perovskites. [150] The cooling rate can be found to be slower than that of pure Pb systems. The first stage involves a monotonic slowdown of Fröhlich interactions between carriers and metal-iodide bonds as the Sn content increases while the second stage deals with the decay of optical phonon into acoustic phonons which is slowest at 60% Sn content.…”

Section: Mixed Tin Halide Perovskitesmentioning

confidence: 95%

“…Therefore, to improve their suitability, the fundamental dynamics of carriers in the materials must be understood. Verma et al showed a two‐stage carrier cooling dynamics in a series of MAPb 1− x Sn x I 3 perovskites . The cooling rate can be found to be slower than that of pure Pb systems.…”

Section: Photophysical Properties Of Sn Halide Perovskitesmentioning

confidence: 99%

“…Mixed A-Site Tin Halide Perovskites: Cation mixing approach has proven to be a facile method for efficiency enhancement www.advancedsciencenews.com in Sn-based PSCs. [89,[138][139][140][141][142] Although chemical composition engineering in the B-site has more pronounced effects on the photo physics of halide perovskites, [141][142][143][144][145][146][147][148][149][150] the A-site components have also shown considerable influence as seen in the application of (FA) x (MA) 1−x SnI 3 as absorber layer in Pb-free PSCs with inverted structure. [89] An optimized ratio of FA and MA cations and the use of SnF 2 yielded an (FA) 0.75 (MA) 0.25 SnI 3 based device with a maximum PCE of 8.12%.…”

Section: Mixed Tin Halide Perovskitesmentioning

confidence: 99%

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Tin Halide Perovskites: Progress and Challenges

Yang

Igbari

Lou

et al. 2019

Advanced Energy Materials

155

121

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The chemical composition engineering of lead halide perovskites via a partial or complete replacement of toxic Pb with tin has been widely reported as a feasible process due to the suitable ionic radius of Sn and its possibility of existing in the +2 state. Interestingly, a complete replacement narrows the bandgap while a partial replacement gives an anomalous phenomenon involving a further narrowing of bandgap relative to the pure Pb and Sn halide perovskite compounds. Unfortunately, the merits of this anomalous behavior have not been properly harnessed. Although promising progress has been made to advance the properties and performance of Sn‐based perovskite systems, their photovoltaic (PV) parameters are still significantly inferior to those of the Pb‐based analogs. This review summarizes the current progress and challenges in the preparation, morphological and photophysical properties of Sn‐based halide perovskites, and how these affect their PV performance. Although it can be argued that the Pb halide perovskite systems may remain the most sought after technology in the field of thin film perovskite PV, prospective research directions are suggested to advance the properties of Sn halide perovskite materials for improved device performance.

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“…In the Pb-Sn alloyed PVSKs, a slower cooling process can be observed with the increasing of the Sn content revealed by Verma and coworkers. 123 The believed the Sn addition would influence all the three stages of the cooling process. First, increasing Sn content would increase carrier density along with stronger carrier-carrier scattering.…”

mentioning

confidence: 99%

Advancing Tin Halide Perovskites: Strategies toward the ASnX₃ Paradigm for Efficient and Durable Optoelectronics

et al. 2020

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Various less-toxic substitutes for the Pb 2+ -based perovskites have been proposedwherein Sn 2+ -based metal halide perovskites (namely, Sn-PVSKs) hold the best prospect due to their comparable optoelectronic properties to Pb analogues. Nevertheless, the intrinsic instability and unfavorable crystallization of Sn-PVSKs place restrictions on both the device performance/durability and the fabrication reproducibility/large-scale manufacturing, respectively. Therefore, numerous attempts have been directed at exploring the underlying mechanisms of Sn-PVSKs and acquiring high-quality, ambient-stable thin films. In this review, a retrospect is firstly given on the milestones and general properties of paradigm ABX 3 structured Sn-PVSKs. Then, their electronic structure evolution, photo-physics process and degradation pathways are thoroughly interpreted. The gained understanding triggers various strategies exploited in the categories of synthetic conditions, compositions, phase components as well as device architecture for diverse optoelectronic applications. The final section summarizes key advances in Sn-PVSKs and meanwhile offers the guidance for future improvements that depends critically on these methodologies.

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Slow Carrier Cooling in Hybrid Pb–Sn Halide Perovskites

Abstract: Experimental methods, fluence dependent pump-probe signal, fluence dependence kinetics, fitting of high energy tail of pump-probe spectra (link).

Cited by 40 publications

References 35 publications

Charge-Carrier Cooling and Polarization Memory Loss in Formamidinium Tin Triiodide

Charge-Carrier Cooling and Polarization Memory Loss in Formamidinium Tin Triiodide

Tin Halide Perovskites: Progress and Challenges

Advancing Tin Halide Perovskites: Strategies toward the ASnX₃ Paradigm for Efficient and Durable Optoelectronics

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Slow Carrier Cooling in Hybrid Pb–Sn Halide Perovskites

Abstract: Experimental methods, fluence dependent pump-probe signal, fluence dependence kinetics, fitting of high energy tail of pump-probe spectra (link).

Cited by 40 publications

References 35 publications

Charge-Carrier Cooling and Polarization Memory Loss in Formamidinium Tin Triiodide

Charge-Carrier Cooling and Polarization Memory Loss in Formamidinium Tin Triiodide

Tin Halide Perovskites: Progress and Challenges

Advancing Tin Halide Perovskites: Strategies toward the ASnX3 Paradigm for Efficient and Durable Optoelectronics

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Product

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Advancing Tin Halide Perovskites: Strategies toward the ASnX₃ Paradigm for Efficient and Durable Optoelectronics